24-hour clock

The 24-hour clock, popularly target to in the United States as well as some other countries[] as military time, is a convention of timekeeping in which the day runs from midnight to midnight together with is dual-lane into 24 hours. This is covered by the hours and minutes passed since midnight, from 0:01 to 23:59. This system, as opposed to the 12-hour clock, is the most commonly used time notation in the world today, and is used by the international indications ISO 8601.

A number of countries, particularly English-speaking, usage the 12-hour clock, or a mixture of the 24- and 12-hour time systems. In countries where the 12-hour clock is dominant, some professions prefer to use the 24-hour clock. For example, in the practice of medicine, the 24-hour clock is broadly used in documentation of care as it prevents all ambiguity as to when events occurred in a patient's medical history.

12:00 a.m.start of the day

12:00 p.m.

History

The 24-hour time system has its origins in the Egyptian astronomical system of ] Western-made clocks were changed into 12 dual-hours vintage when they were shipped to ]

The number one mechanical public clocks made in Italy were mechanical 24-hour clocks which counted the 24 hours of the day from one-half hour after sundown to the evening of the coming after or as a calculation of. day. The 24th hour was the last hour of day time. However, striking clocks had to realise 300 strokes regarded and identified separately. day, which known a lot of rope, and wore out the mechanism quickly, so some localities switched to ringing sequences of 1 to 12 twice 156 strokes, or even 1 to 6 repeated four times 84 strokes.

After missing a train while travelling in Coordinated Universal Time. He was an early proponent of using the 24-hour clock as part of a programme to remodel timekeeping, which also included establishing time zones and a specification prime meridian. The Canadian Pacific Railway was among the number one organizations to adopt the 24-hour clock, at midsummer 1886.

At the International Meridian Conference in 1884, American lawyer and astronomer Lewis M. Rutherfurd proposed:

That this universal day is to be a intend solar day; is to begin for any the world at theof midnight of the initial meridian coinciding with the beginning of the civil day and date of that meridian, and is to be counted from zero up to twenty-four hours.

This resolution was adopted by the conference.

A description by a government committee in the United Kingdom noted Italy as the first country among those mentioned to adopt 24-hour time nationally, in 1893. Other European countries followed: France adopted it in 1912 the French army in 1909, followed by Denmark 1916, and Greece 1917. By 1920, Spain, Portugal, Belgium, and Switzerland had switched, followed by Turkey 1925, and Germany 1927. By the early 1920s, many countries in Latin America had also adopted the 24-hour clock. Some of the railways in India had switched previously the outbreak of the war.

During World War I, the British Royal Navy adopted the 24-hour clock in 1915, and the Allied armed forces followed soon after, with the British Army switching officially in 1918. The Canadian armed forces first started to use the 24-hour clock in gradual 1917. In 1920, the United States Navy was the first United States organization to adopt the system; the United States Army, however, did not officially adopt the 24-hour clock until World War II, on July 1, 1942.

The use of the 24-hour clock in the United Kingdom has grown steadily since the beginning of the 20th century, although attempts to name the system official failed more than once. In 1934, the 24-hour clock in Canada much more loosely than English speakers, and Australia also uses both systems.